docs: def health(self, indices=None, level="cluster", wait_for_status=None,
                 wait_for_relocating_shards=None, timeout=30):
          """
          Check the current :ref:`cluster health <es-guide-reference-api-admin-cluster-health>`.
          Request Parameters
  
          The cluster health API accepts the following request parameters:
  
          :param level: Can be one of cluster, indices or shards. Controls the
                          details level of the health information returned.
                          Defaults to *cluster*.
          :param wait_for_status: One of green, yellow or red. Will wait (until
                                  the timeout provided) until the status of the
                                  cluster changes to the one provided.
                                  By default, will not wait for any status.
          :param wait_for_relocating_shards: A number controlling to how many
                                             relocating shards to wait for.
                                             Usually will be 0 to indicate to
                                             wait till all relocation have
                                             happened. Defaults to not to wait.
          :param timeout: A time based parameter controlling how long to wait
                          if one of the wait_for_XXX are provided.
                          Defaults to 30s.
          """
          if indices:
              path = make_path("_cluster", "health", ",".join(indices))
          else:
              path = make_path("_cluster", "health")
          mapping = {}
          if level != "cluster":
              if level not in ["cluster", "indices", "shards"]:
                  raise ValueError("Invalid level: %s" % level)
              mapping['level'] = level
          if wait_for_status:
              if wait_for_status not in ["green", "yellow", "red"]:
                  raise ValueError("Invalid wait_for_status: %s" % wait_for_status)
              mapping['wait_for_status'] = wait_for_status
  
              mapping['timeout'] = "%ds" % timeout
          return self.conn._send_request('GET', path, params=mapping)